public class Example4_10{
  public static void main (String args[]){
	Lader.下底 = 100;
	Lader laderOne = new Lader();
	Lader laderTwo = new Lader();
	laderOne.设置上底(28);
	laderTwo.设置上底(66);
	System.out.println("laderOne的上底："+laderOne.获取上底());
	System.out.println("laderOne的下底："+laderOne.获取下底());
	System.out.println("laderTwo的上底："+laderTwo.获取上底());
	System.out.println("laderTwo的下底："+laderTwo.获取下底());
	}
}

